(四)F字签证发给应邀来中国访问、考察、讲 学。经商、进行科技文化交流及短期进修、实习 等活动不超过6个月的人员; 4 Visa f to aliens who are invited to china on a visit or on a study, lecture or business tour, for scientific technological or cultural exchanges for short -term refresher course or for job training, for a period not more than six months▪ （四）F字签证发给应邀来中国访问、考察、讲 学。经商、进行科技文化交流及短期进修、实习 等活动不超过6个月的人员； 4）Visa F to aliens who are invited to China on a visit or on a study，lecture or business tour， for scientific technological or cultural exchanges， for short－term refresher course or for Job－ training，for a period not more than six months；